Britain's Catherine, Duchess of Cambridge (front, fifth from right), poses with the cast, crew and producers of British television series "Downton Abbey" during an official visit to the set at Ealing Studios in west London on March 12, 2015.

Britain's Catherine, Duchess of Cambridge (front, fifth from right), poses with the cast, crew and producers of British television series "Downton Abbey" during an official visit to the set at Ealing Studios in west London on March 12, 2015. (Chris Jackson / AFP / Getty Images)

Kate Middleton and Prince William commemorated London Poppy Day by making a surprise appearance Thursday at a London Tube Station.

The Duke and Duchess of Cambridge took a chartered 1960s Routemaster bus -- one of London's famed double-deckers -- from the High Street Kensington station, just a quarter mile from their Kensington Palace home, in order to visit volunteers and poppy sellers to raise funds for war veterans, the Telegraph reported.

The royal British Legion's "Poppy Day" rounded up about 2,000 volunteers in London's streets to help raise $1.6 million in one day to benefit Britain's war dead ahead of Remembrance Sunday, the Associated Press reported.

Prince George's parents, both 31, pinned red poppies to their coats for the Thursday event to commemorate war casualties. For the occasion, the duchess wore a long red belted L.K. Bennett coat, which aptly matched the poppies and her selected mode of transportation.

It isn't the first time we've seen the royals take public transportation recently. Back in March, Middleton, Queen Elizabeth II and her husband, the Duke of Edinburgh, boarded London's Underground trains to celebrate 150 years of the transit system. Since the duchess was pregnant with George at the time, she was presented with a "baby on board" pin. (Adorbs, right?)

To the British media's delight, not everything was picture perfect for the royal couple. Tabloids played up the new mom's few gray hairs, which were noticeable from her center part, the Daily Mail noted.

But it's not as if her brunet mane is necessarily the last thing on her mind: The Telegraph reported last month that Middleton already booked a hairdresser for her tour of Australia with her husband in 2014.

In other royal news, Taylor Swift is set to perform at the royals' Winter Whites Gala on Nov. 26 along with Jon Bon Jovi and James Blunt. The winter wonderland-themed event is aimed to benefit the homeless youth charity Centrepoint, which the duke has been working with since 2005.

She's pretty "excited" about it too.

"I'm really stoked. This is my first thing I've performed at for any kind of royal engagement and I'm very, very honored," the country-pop singer told BBC Radio 2.

Britain's Prince William and Catherine, Duchess of Cambridge, brought their son, Prince George, to Chapel Royal in St James' Palace in London for his christening. Prince George was christened with water from the River Jordan at a rare four-generation gathering of the royal family. Full story